21555266665014 has 24 divisors (see below), whose sum is σ = 47131546381920. Its totient is φ = 7119170641008.

The previous prime is 21555266665001. The next prime is 21555266665027. The reversal of 21555266665014 is 41056666255512.

It is an interprime number because it is at equal distance from previous prime (21555266665001) and next prime (21555266665027).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5493185262 + ... + 5493189185.

It is an arithmetic number, because the mean of its divisors is an integer number (1963814432580).

Almost surely, 2^{21555266665014} is an apocalyptic number.

21555266665014 is an abundant number, since it is smaller than the sum of its proper divisors (25576279716906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21555266665014 is a wasteful number, since it uses less digits than its factorization.

21555266665014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10986374564 (or 10986374561 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 54.

The spelling of 21555266665014 in words is "twenty-one trillion, five hundred fifty-five billion, two hundred sixty-six million, six hundred sixty-five thousand, fourteen".